Autocrypt
Implement e2e encryption with the Autocrypt (Autocrypt.org) specification. It is already being implemented (or already implemented) in several desktop and mobile mail clients, including Thunderbird (via enigmail) and K9Mail.
Yahoo! is still one of the world's largest and most influential email providers. Throwing it's weight behind new security specifications can only help those specifications become standardized.
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B. Charles Reynolds
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Thank you for the feedback! We will take this into consideration in future releases.